Wos Activation Problem

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I recently brought the World of Subways but it have a strange problem:

Anytime i start this simulator it question me to activate it. I insert the correct serial and email, it say me that "key is valid and stored" and starts correctly BUT when i want to start again this simulator, it say me that i must activate it again, this is very very annoying.

Please help me!

I have Vista OS and also tried with anti-virus and others applications closed without success.